Mixer



I Dec. 31, 1946.- A. c. CHRISTENSEN 2,413,603

MIXER Filed May 10, 1944 4 Sheets-Sheet l Dec. 31, 1946- A. c. CHRISTENSEN 2,413,503

MIXER Filed May 10, 1944 4 Sheets-Sheet 2 ZNI/ENZ U5 @Zred C Cfirz'qzenscn M 5 Dec. 31, 19 6 A. c. CHRISTENSEN 2,413,603

MIXER Filed May 10, 1944 4 Sheets-Sheet 5 fled G Cfirz'slensen Dec. 31, 1946. A. c. CHRISTENSEN 2,413,603

MIXER Filed May 10, 1944 4 Sheets-Sheet 4 k3 ZNVENZ U5 fl/red C. Christensen Patented Dec. 31, 1946 UNITED STATES PATENT OFFICE MIXER Alfred C. Christensen, Chicago, Ill., assignor to Herbert S. Simpson, Evanston, Ill.

Application May 10, 1944, Serial No. 534,912

Claims.

This invention relates to a material mixing machine and concerns itself more particularly with a portable type of small mixing and mulling machine, such as one four feet in diameter or smaller. The invention further relates toadjustable plow means and novel shaped mulling means mounted and positioned to prevent packing of'material such as sand around the central unit of the machine. The machine furthermore having replaceable means coac'ting with and varying the pressure of the mulling means on the material without necessitating the replacement of the mulling means for varying the effective pressure exerted thereby.

It is an object of this invention to provide a small portable size material treating machine of improved, simplified and effective construction adapted to effect a desired treatment for a maximum load by a novel shaping and positioning of standard mulling means, the effective pressure of which may be suitably varied.

It is also an obiect of this invention to provide an improved portable and small size mixer wherein a maximum load treatment may be effected by the novel shaping and positioning of the mullers.

It is furthermore an object of the invention to provide a small sized material mixer and muller including replaceable weights for varying the effective pressure exerted by standard beveled mullers.

Still another object of the invention is to provide a simple and effective mixing and mulling machine embodying canted beveled mullers, the supports for which are designed to carry replace-- able weight members permitting the mullers to exert different pressures on different kinds of material without necessitating replacement of the mullers.

Another object of the invention is the provision of a small portable mixing and mulling machine wherein the overall clearance beneath the machine is permitted to be decreased by the uti lization of 'a horizontally operable slide door mechanism for effecting emptying of the machine and by providing the machine with a rotatable cover having a sid port to facilitate loading from any side of the machine while in operation.

Still another object of the invention is to provide a mulling machine includin canted beveled mullers adapted to be efiectively positioned to move in a treating area and obviatin the jamming and piling up of the material in the center of the treating area, thereby effecting an arrangement for increasing the eiiiciency of the small machine so that practically all of the material of a load is subjected to the required treatment.

It is furthermore an object of the invention to provide a portable type of mixer and muller of substantially small diameter wherein the mullers are canted and beveled to permit the same to operate in a path of maximum diameter to obviate jamming and piling up of the material between the mullers and the turret to which the load of the mulling mechanisms is transferred through suitable roller bearing means.

Another object of the invention is the provision of a portable type of mixer and muller of relatively small diameter wherein the mullers are adjustably weighted and are of a standard size and so shaped and mounted that they can travel in a treating area'as near as possible to the wall of the container for the purpose of treating the material as it is moved into the path of oper-v ation of the mullers by plow and mixer mechanisms adjustably mounted for are adjustment toward and away from the mullers as required.

It is an important object of the invention to provide a portable type of mixing and mulling machine'of substantially small diameter wherein the plows and scrapers may either be carried on plow beams rigid on the propulsion head or by a support rotatably adjustable on the muller propulsion head to permit the plows and scrapers to be moved toward and away from the respective mullers to increase the efliciency of operation of. the machine to meet varying conditi ns.

It'isa further object of the invention to provide a portable ty e of mixer and muller of substantially small diameter in which the efi'iciency of operation is increased by widening the tread area traversed by standard sized mullers by vertically positioning one of the mullers while the other is beveled and canted to permit the same to operate through an area of greater diameter than the diameter of the area traversed by the vertically positioned muller.

It is an important object of this invention to provide a portable type of mixing and mulling machine of substantially small diameter and of high operating efficiency occasioned by the novel shaping, arrangement'and mounting of the treating mechanism within the restricted area of a small container for which the overall clearance of the bottom is decreased by the adoption of a discharge door having a horizontal swinging action in the plane of the bottom of the container and by the adoption of a rotatable cover having a side .port permitting side loading from a low level whenthe machine is in operation without endangering the person depositing material in the machine.

An additional object of the present invention is to provide a substantially small diameter mixing and mulling machine adapted for small foundries and the like which will be continuous and efficient in its operation, simple and inexpensive to make, easy to use, positive in action, and a general improvement in the art.

For the attainment of the foregoing and other objects and advantages, the invention preferably consists in the details of construction and the arrangement and combination of parts to be hereinafter more fully described and claimed, and illustrated in the accompanying drawings.

On the drawings:

Figure 1 is a top plan View of a'foundry mixer and muller with the cover removed and embodying the principles of this invention;

Figure 2 is a vertical sectional view taken on line 11-11 of Figure 1 with the pedestal or base and other parts shown in elevation; said View also showing in dotted lines a modified-form covering vertical positioning of one of the mullers leaving the other canted;

Figure 3 is an enlarged fragmentary horizontal detailed sectional view taken on line III-III of Figure 2 and including a fragmentary portion of the muller weight control;

Figure 4 is a fragmentary sectional view taken on line IVIV of Figure 3;

Figure 5 is an enlarged horizontal sectional view taken on line VV of Figure 2 illustrating the plow and scraper mechanisms and the rotatable adjustable mounting therefor with respect to the rotatabe muller carrying propulsion head of the machine whereby both the plow and scraper mechanisms may be swung toward and away from the respective mullers of the machine;

Figure 6 is a fragmentary sectional view similar to that of Figure 5 but covering a modified form for rotatable adjustment of the plow mechanism only on the muller carrying head with the scraper mechanism either omitted or rigidly supported on the rotatable muller carrying propulsion head of the machine;

Figure 7 is a top plan view 'of the foundry mixer and muller, with the cover omitted and illustrating a modified form of combination weight and shield removably supported on the pins of the muller carrying brackets;

Figure 8 is an enlarged fragmentary vertical sectional view with parts 'in'elevation and showing the propulsion head and its roller bearing support through which the load carried by said head is transferred to the machine turret to relieve the driving shaft; and

Figure 9 is a perspective elevational view of the small size portable mixing and mulling machine, showing the exterior of the crib and "the cover supported on a modified form of pedestal.

As shown on the drawings:

The foundry mixer and muller of the type here- I in described and claimed, .is one adapted for use in small foundries or in other establishments requiring a small sized mixer and muller which may be conveniently handled and moved around. The improved machine is designed and constructed to produce an increased eihciency for a small type of machine of substantially four feet or less in diameter in which the mulling mechanisms may be mounted and positioned to operate substantially close to the walls of the machine crib or pan in such a manner that the material being treated is not permitted to jam and pile up around the machine turret to the inside of the mullers but is adapted to be subjected in its entirety to the action of the mixers and mullers to permit the machine to maintain its maximum load.

The machine is also designed and constructed with an improved discharge mechanism operating on a horizontal slide arrangement that the overall clearance between the bottom of the machine crib or pan and the floor maybe decreased to provide a low machine which may be conveniently loaded manually from the side by an attendant standing on the floor.

To facilitate the movement of the material comprising a maximum batch load for the machine so that it is all subjected to the required mixing and mulling treatments, the machine is provided with a novel arrangement for mounting the plows and scrapers to rotatably swing on the rotating muller supporting head thereby permitting the plows and scrapers to be moved toward and'away from the muller mechanisms carried by the head to facilitate the proper shifting of the material into the path of travel of the muller mechanisms.

The machine is also designed and constructed to include beveled mullers supported on inclined shafts in suitable adjustable supports whereby the mullers are canted to permit the same to be positionednearer the walls of the crib or pan than would be possible if they were vertically positioned. The arrangement also affords a means of using standard mullers of a given size and weight, the effective weight of which is adapted to be varied by means of a combination shield and weight device replaceably mounted on the muller supports to increase the e-fiective exerted pressure thereof without interfering with the desired vertical movement of the mullers during a materialtreatment.

More specifically the improved portable substantially small sized foundry mixer :and muller of this invention comprises a base housing or pedestal I provided with a door or removable panel 2 to afford access to a gear housing or case 3 supported on the inner side of the top wall of the base housing I. The gear housing -3 contains any standard gear driving mechanism adapted to be operated from "the driving shaft of a driving motor 4 supported on the base housing side wall and projecting into the base housing as clearly illustrated .in Figure 2.

Rigidly mounted upon the top of the base housing I is a foundry sand treating .unit consisting of a container or crib in which the material operating mechanism are engaged. The container or crib comprises a bottom or floor 5 preferably of circular shape and provided with a peripheral flange or rim 6. Seated upon the top face of the crib bottom 5 is wear plate 1. Supported upon the crib bottom 5 and fastened to the inner side of the top portion of the bottom flange 6 is a circular or cylindrical crib Wall 8.

As clearly illustrated in Figure 2, the crib bottom 5 and the wear plate! supported thereon are both provided with an arc-shaped or elliptic discharge opening in a marginal portion of the crib bottom to the inside of the side wall '8 and to the outside of the base housing I to facilitate the easy discharge of a batch of material downwardly through the crib bottom after the material has been treated in the crib or container. The arcshaped door opening extends through the flange 6 of the bottom to communicate with a horizontal slot provided in an arc-shaped door bracket 9.

The elliptic door opening is indicated by the ref-j erence numeral I and is shaped to receive a pivotally supported horizontally positioned "discharge door I l which is fan or sector shaped consisting of the main'door portion provided with an arc-shaped edge to coact with the arc-shaped e ge of the dischar e opening in the crib bottom. The door II is provided with a tapered section I 2, a portion of which is rigidly secured by means of bolts 13 to a flange of a door operating handle l4. The pivoted end of the handle I4 is engaged in the bracket 9 between suitable upper and lower flanges which are apertured to receive the ends of a door pivot pin l5 which projects through one endof the handle and is rigidly secured therein by means of a set screw Hi.

In a small capacity mixer and muller in which a crib or pan of four feet or less in diameter is required, it is desirable to have the overall clearance between the bottom of the crib and the bottom of the crib supporting base or pedestal reduced as much as possible so that in the improved small capacity machine herein disclosed the ordinary trap or drop variety of door with its complicated operating mechanisms has been replaced by the horizontally swinging sector shaped door II. The improved door is operable by means of the handle M to swing the door from the closed full line position of Figure 1 into the open dotted line position when it is desired to discharge the contents of the crib after a mixing and mulling treatment of the sand or material is completed.

Integrally formed on or rigidly secured to the central portion of thecrib bottom 5 is an upwardly projecting bearing support or turret 11. A driven gear in the gear housing 3 is secured on the lower end of a driving shaft is. The shaft l8 projects up through the turret I! and is journaled therein by means of a roller vbearing unit. Keyed or otherwise rigidly secured on the upper projecting end of the driving shaft I8 is aspider or propulsion head 20 which includes a pair of oppositely projecting arms 2!. Each of the arms 2| has rigidly secured in an opening therein one end of a stub shaft or axle 22 on the projecting end of which a muller supporting bracket or rocker arm 23 is pivotally supported.

The roller bearing unit comprises conical bearing rollers l9 positioned between-an inner race 56 and an outer race 51. By this arrangement the load of the propulsion head ldand the parts.

attached thereto is not carried by the vertical shaft but said load is transferred directly to the turret IT. A turret sealrin 58 is engaged between the turret l1 and the shaft I8. A propulsion head seal ring 59 is engaged around a reduced upper part of the turret I 1 (as shown in Figure 8) and projects upwardly into a groove in the lower end of the propulsion head 20. This affords an arrangement permitting replacement of the seals when they become worn, thereby obviating replacement of any major parts.

Integrally formed on the' bottom of each of the muller supporting brackets 23 is a downwardly projecting bracket extension 24 (Figure 4) having integrally formed thereon a bearing sleeve 25 which, as clearly illustrated in Figure 2, is inclined upwardly and outwardly. Journaled in the inclined sleeve 25 is a muller supporting stub shaft 26 which is inclined upwardly at a suitable angle and has supported on the outer projecting end thereof a conical or beveled muller or wheel 21, which, due to the inclination of the stub shaft 26, positions the muller or wheel in a plane slightlyoff perpendicular so that the muller or wheelis canted permitting the beveled or conical tread surface or perip y f the muller H or wheel to track on the wear plate 7 forming part of the bottom of the material containing crib or container.

' The canted positions of the two opposite mullers or wheels 2'! permits the mullers to have the lower pressure exerting portions thereof positioned substantially close to the crib wall 8, thereby allowing more space between the lower portion of the mullers and the turret H to obviate any tendency of the material being treated to jam and pile up around the turret. With the mullers canted, the jamming and piling of material around the pedestal is done away with so that'the small capacity machine is adapted to subject all the material of a batch or load to mixmullers or wheels 21 which are of a. standard selected size and weight suitable for the size of the crib. It is intended to use the standard size and weight mullers to obviate the necessity of using replaceable mullers of different sizes' and weights. This feature is accomplished by providinga means for varying the effective pressure exerted by the canted mullers by means of a special and effective interchangeable weight arrangenient.

The effective weight of the'standard mullersZl is adapted to be increased by means of a replaceable weight 2 8 which may be of a selected weight and shape such as shown in Figures 1 and 2, wherein the weight is hemispherical in shape and is provided with an opening 29 in the top middle portion thereof. While a hemispherical or rounded type of weight 28 is illustrated; it is to be understood that the weight may be of pyrami dal or conical shape or of any other selected shape desired. The Weight 28 has formed diametrically on the interior thereof a pair'of down wardly opening boxes 30 in each of which a flexible packing or cushion 3| is engaged. Each of the packingsor cushions 3| is constructed of solid rubber or other suitable flexible material and is held in place by means of a retaining plate 32 provided I with a suitable opening to permitpa weightis'upporting pin 33 to project into a suit able opening in the packing or cushion.

-The pins 33 are diametrically positioned, as clearly illustrated in Figures 1 and 3, and project upwardly from the tops of the free ends of the muller supporting brackets or rocker arms 23 so that the weight 28 rests on the supporting pins 33 on the brackets or rocker arms 23 to increase the effective or operating weight of the standard mullers 21.

The central opening 29 in the weight 28 is pro: vided to permit universal movement of the weight 28, as the mullers are rotated and rise and fall within the crib as they pass over the material which is beingmulled. I The opening 29 in the weight 28 is also provided to permit the threaded end of an eyebolt 34 to be projected downwardly through the weight after the weight is placedin position. If desired the opening 29 may be large enough to permitthe weight to be engaged over the head of the eyebolt I to elevate the machine to permit movement thereof into any desired place needed. The lower end of the eyebolt is rigidly threaded into a cap 35 which is rigidly secured on the top of the propulsion head Hi. The cap 35 encloses the upper end of the driven shaft It as illustrated in Figure 2.

By referring to Figure 4, attention is calledto the weight supporting pin 33 supported on one of the brackets or rocker arms 23 and which projects upwardly into a suitable recess provided in the rubber cushion 3| within the box 30 of the Weight member 28. This arrangement of having weight supporting pinsprojecting into the cushioning material carried in the weight boxes permits relative movement of the weight 28 with respect to the brackets 23 caused by the irregular movement of the mullers over the material being treated in the crib. It will thus be noted that the rubber cushions 31 not only protect the weight supporting pins but also permit a substantially free movement of the weight with respect to the muller carrying brackets or rocker arms 23 when the machine is in operation. While a hemispherical Weight 28 is illustrated in Figures 1, 2 and 3 as being supported on the bracket arm pins 33, it is to beunderstood that any desired modification in the shape of the weights may be used and the thickness of the material of the selected shaped weight may be such as to provide the desired weight which is to be applied to the muller brackets 23 for transmittal to the mullerstoincrease the eifective mulling pressure thereof.

In Figure '7 a modified vform of weight 36 is illustrated. The modified weight 36is of pyramidal shape having slanting walls to provide a substantially oblongor rectangular base portion positioned to extend diametrically in the crib at right angles to a vertical plane passing through the axes of the muller stub shafts 26 so that operating mechanisms of the machine are protected from any sand which might be deposited from above into the crib. Any sandor material striking the'inclined side walls of the weight 35 isv deflected outwardly towards the outer areas of the crib thereby preventing the material from getting into the working parts. The modified form of weight 36 is also provided with two oppositely positioned auxiliary shields or gables 31 which extend outwardly over the muller bearing sleeves to shield or protect the same from material entering from above or whichmight be thrown upwardly by the action of the treating mechanisms. The pyramid shaped weight 36 has formed on the interior thereof two diagonally opposite boxes including resilient cushions. 3| similar to the arrangement shown in Figure 4 to permit the pins 33 to engage in the cushions 3| when the modified form of weight 35 is engaged in position as illustrated in Figure 7. The apex or upper portion of the weight 36 isprovided with a circular opening 38 to permit the threaded end of the eyebolt 34 to be projected downwardly through the weight to be secured to the cap 35 to permit the eyebolt 34 to be used as a means for elevating the machine so that it may be conveniently moved into difierent locations as required.

The improved portable small size machine, of this invention, in addition to being equipped with the canted beveled mullers for subjecting the material in the crib to mulling treatments is also equipped with mechanisms for mixing and plowing the material and for moving the material into the path of travel of the rotating canted mullers as; they are propelled by means of the rotatable Y 8 propulsion head 20 when the driving shaft I8 is rotated.

In Figure 5, an efficient mulling and scraping unit is disclosed within the machine crib or pan and said mechanism is rotatably adjustable on the propulsionhead 24]. The mixing and plowing unit consists of a mounting collar or ring 39 which is adapted to be locked in a set position of adjustment on the'head 20 by means of set screws 48, or other suitable securing means, so that the ring 39 isgadapted to' be rotated by the propulsion head it. Integrally formed radially on one side of the collar 39 is a long plow beam or arm 4i having a plow supporting auxiliary bracket 42 provided with vertical slots to permit the same to be vertically adjusted With respect to the arm 4! by means of the screw bolts 43. Bolted or otherwise secured to the auxiliary bracket i2 is a combination scraper and plow blade 44 the lower edge of which is adapted to be positioned to move 'over the crib .wear plate 7 while one outer edge of the blade 44 is positioned to move around over the inner face of the crib wall 8 to scrape the material therefrom and to move the material inwardly away from the Wall into the path of travel of the mullers.

Also integrally formed or rigidly secured on the collar or ring 38 in a position substantially diametrically opposite to that of the arm El is a short bracket arm 45 which is slotted to receive a vertically adjustable. auxiliary bracket plate lfiprovided with vertical slots to permit the plate to move upwardly and downwardly when retaining screw bolts 41' engaged therethrough, are loosened. The auxiliary bracket plate 46 has removably secured thereto, by means of bolts or other suitable means, an'arc-shaped inner plow blade l8. The plow blade 48 is positioned nearer the turret of the machine than the combination scraper and plow blade 54, so that the material around the middle portion of the crib is adapted to be plowed and moved outwardly in the crib into the path of travel of the mullers 2'1.

When only aninner plow mechanism is required in the machine the double plow units supported on the collar 39 and illustrated in Figure 5 may be omitted and replaced by a plow unit consisting of a rotatably adjustable collar or ring as which is adapted to be secured in a set position of adjustment on the propulsion head 26 by means of set screws 58 or the like. The collar'or ring 59 is provided with acomparatively short bracket arm 5! which is grooved to receive a vertically adjustable auxiliary bracket plate 52 having slots therein to permit vertical adjustment thereof by the proper adjustment of screw bolts 53. Bolted or otherwise removably secured to the auxiliary bracket plate 52 is a curved plow blade 54.

In a similar manner if the inner plow blade 8 is not required and it is only desired to have an outer combination scraper and plow blade i the short plow blade bracket mechanism may be omitted. A plow collar may then be rotatably engaged on the propulsion head 20, and said collar may be equipped only'with a long plow blade, carrying beam or arm M supporting the auxiliary plow blade mechanism 44 on the end thereof.

Particular attention is called to the novel advantages which are obtained by the use of providing plow blades on bracket arms which are supported on a collar or ring which is rotatably adjustable on the propulsion head 26 of the ma- Chine so that by loosening the set screw mechagroove 6 I.

nisms associated with the collar or ring the plow blades may be moved toward and away from the respective mullers in .the machine by the rotat- I able adjustment of the plow carrying arms with respect to the bearing sleeves or arms 25 of the muller mechanisms. It will thus be noted that the plow and scraper blades of the machine may be adjusted vertically and that they may also be rotatably moved into different positions on the propulsion head 29 toward and away from the respective mullers 21 as required.

In case a machine is required wherein the rotatable adjustment of the scraper and plow blades with respect to the mullers is not required, the plow blade carrying brackets or arms 4| and 65 may be integrally formed on the propulsion head arms 2! in which case the plow blades may be adjusted vertically only but are permanently located with respect to the distance from the respective mullers 21.

By referring to Figure 2, it will be noted that the two canted beveled mullers 21 are adapted to travel over substantially the same path within the mixing and mulling crib and substantially close to the inner face of the crib wall 8. In order to provide an arrangement whereby a wider path of mulling treatment may be provided in a small portable type of mixing and mulling machine a mulling arrangement may be provided to include only one canted beveled muller 21 and a second vertical muller or wheel 55 on which the peripheral surface is at right angles to the sides of the muller. The muller 55 may be positioned vertically within the crib on a bracket arm which is formed at right angles to a muller supporting bracket or rocker arm 23 instead of at an inclined angle with respect thereto. By referring to Figure 2 it will thus be noted that the vertical muller If desired the machine may be provided with a modified form of base or pedestal 69 in place of the pedestal l. The base 69 is of a cylindrical type having an opening "it to afiord access to the gear housing and other parts enclosed in the base.

For conveniently starting and stopping the machine, an electric switch box H is mounted on the rim 6 of the machine and is provided with the necessary start and .stop buttons for controlling the operation of the machine.

The operation is as follows:

With the parts assembled and described as shown in Figures 1 and 2, the machine is started by pushing the starting button of the control switch 1 I. Foundry sand or other material which is to be mixed and mulled is manually shoveled into the cover chute 66 and passes through the loading port 6'! into the crib 8. If desired, the material may be directed into the receiving chute 66 of the cover 62, from a feed pipe leading from a supply hopper or the like. The cover 62 may be turned by means of the handles 65 to position the material receiving chute 68 on any side of the machine desired. When the material is deposited in the crib the horizontally slidable or pivotally swinging door II is in its closed position so that the material is retained in the crib. Any other ingredients which are to be mixed with the sand or material may be deposited in the crib through the loading port 6'! to be thoroughly mixed and mulled with the sand, to properly treat the same and. condition the sand for use.

The mixing and mulling mechanisms are accomplished through the medium of the driving 4 motor 4 which is adapted to be started, by means wheel 55 will travel over a path which is to the inside of and slightly overlapping the path traversed by the canted beveled muller wheel 21 so that a wider mulling path is provided in the crib;

cult but is also dangerous due to the fact that the mullers when in operation tend to kick the material out. Top loading by shoveling is also dangerous to the attendant since there is a possibility that the shovel may contact the mullers and accidentally drag the attendant into the machine.

To obviate these dangers, the container or crib 8 is of comparatively low height and has the top rim 69 thereof provided with a circular The crib 8 is closed by means of a removable hood or cover 62 having a bottom rim 63 adapted to seat in the crib groove 6| permitting an external bead 64 to seat upon the top rim 60 of the crib 8. The cover is provided with handles 65 to facilitate rotation of the cover on the crib to permit a loading chute 66 and a side loading port 61 to be positioned to permit loading of the machine from any side thereof by an attendant. The material may thus be shoveled into the chute 66 to be directed into the crib 8, without danger of the shovel contacting the mullers or operating parts of the machine. The cover also prevents the material from being kicked out of the machine crib when the machine is loaded while in operation. The cover 62 is provided with a top opening 68 to permit the eyebolt 34 to project therethrough when the cover 62 is put in place or removed.

ing on their respective axes around over a predetermined circular path in the crib. The inner plow blade 43 causes the material to turn over and move outwardly while the outer scraper blade 44 acts to turn over the material and scrape the same from the crib walls causing the material to be thrown or moved inwardly into the paths of the mullers. The plows thus act to turn and move the sand mixture alternately outwardly and inwardly into the paths of the beveled canted mullers 21, thereby causing the sand and the ingredients in the crib to be thoroughly mixed, squeezed, kneaded and mulled by the weighted mullers to change the mixture from a friable and loose condition into a strong, tough and plastic mass without breaking or crushing the grains of. the sand or material and therefore maintaining the original porosity and openness of the mixture.

When the mixture has been sufficiently mulled and kneaded an attendant has only to swing the door handle M, from the full line position of Figure 1 into the dotted line position, thereby causing the horizontally positioned door H to move outwardly in a horizontal plane out of the crib bottom opening into the dotted line open position, thereby opening the bottom of'the crib to permit the treated material to be discharged from the machine.

When selected kinds of materials are to be treated, and require certain pressures to be exerted by the mullers, a weight 28 of selected isses 11 weight may be substituted for a weight inthe machine. The selected weight may thus be transferred through the pins 33 to the mullers. It will thus be seen that different sized weights may be conveniently used to meet requirements.

It is to be understood that, in case the cover 62 is not required it may be removed, in which case the material may be deposited into the top of the crib 8, with the weight 28 serving as a shield to direct the material into the crib and at the same time prevent the entering material from getting into the working joints and parts of the treating mechanisms of the machine. When the cover 52 is omitted, a crib having higher side walls may be used.

By mounting the plow blades on a plow beam and bracket arm carried on the mounting ring 39, said blades may be moved toward or away from the respective mullers 21 when conditions require such adjustments. When no adjustment of the plow blades is required the ring 39 may be emitted, in which case the plow beam 41 and the bracket arm 35 may be integrally formed on the propulsion head 251. v

I It isto be understood that various details of construction may be varied through a wide range without departing from the principles of this invention, and it is, therefore, not the purposeto limitthe patent granted hereon otherwise than necessitated by the scope of the appended claims.

I claim as my invention; V H

1. A mixing and mulling machine comprising a container, a shaft journaled in said container, means for driving said shaft, a propulsion head secured upon said shaft within the container, muller bracket pivotally supportedonsaid head, beveled mullers, means for rotatably mounting the beveled mullers on said brackets in canted positions, and means supported on said brackets or varying the effective operating weights of the beveled canted mullers.

2. A mixing and mulling mechanism comprising a container, a driving mechanism in said container, bracket members pivotally supported thereon, beveled mullers rotatably mounted on said brackets to position the mullers in canted relationship with respect to one another and with respect to the 'containen'a weight member removably supported on said brackets for increasing the effective operating weight of the beveled canted mullers, scraping and plow members, a support for said scraping and plow members rotatably mounted on said driving mechanism, and

'means for vertically adjusting the scraping and plowing members. i

3. A mulling machine comprising a container, a driving shaft jounalled therein, means for operating the driving shaft, 9, propulsion head on the driving shaft within the container, brackets pivo'tally supported on the propulsion head, beveled "mullers rotatably supported on said brackets with the mullers canted with respect tonne "another,

'pins on said brackets, a weight member removably supported on said pins for varying the effective operating weight of the beveled canted mulll ersjand cushioning means betweensaid pins-and ingtshaft, a propulsion head secured on thedriving shaft, brackets pivotally supported on the propulsion head, beveled mullers rotatably sup- Bil f'eontainer, mulling means therein, weight means fre'movably supported on the mullin rnea'ns for varyingthe effective v'veight thereof, acover for the container, ema-n5 connected with the r'nulling' means and' pro'jecting through theweight mg of the machine for movement into difierent locations.

ported on said brackets and in canted relationship with respect to one another, pins supported on said brackets, a weight member removably supported on said pins for varying the weight of the beveled canted mullers, cushioning means positioned between said pins and the weight member, andmeans connected with the propulsion head and engageable to permit convenient moving of the machine to different locations.

5. In a mixer of the class described including a material container, a driving shaft journalled therein, means for operating the driving shaft, a propulsion head on the driving shaft, a bracket pivotally supported on the propulsion head, a beveled muller rotatably mounted on the bracket in a canted position, a second bracket pivotally mounted on the propulsion head, a muller rotatably supported thereon, pins on said brackets, and a weight removably supported on said pins for increasing the effective operating weight of the mullers.

6. In a mixer of the class described including a material container, a cover thereon, loading means in the side of the cover, a driving shaft journalled in the container, means for operating the driving shaft, a propulsion head on the driving shaft, a bracket pivotally supported on the propulsion head, a beveled muller rotatably mounted on the bracket in a canted position, a second bracket pivotally mounted on the propulsion head, a muller rotatably supported thereon, pins on said brackets, a weight removably supported on said pins for increasing the effective operating weight of the mullers, and resilient cushioning means between said weight and said pins to permit movement of the weight member as a result of the movement of the mullers over the material in the container.

er mechanisms and the weight means.

I 8. In a material treating machine of the class described including a container, a driving unit rotatably mounted therein, a pair of mullers in said container, and bracket means pivotally carried by the driving unit for supporting the mullers rotatably with one of said mullers being'bev- "eled'and'rotatablein anihclined plane while the other of said mullers is rotatable in a vertical plane, said mullerstraveling inoverlapping paths in the container to provide 'a widened mulling "area within the container.

:9. In a materialtreating machine'of the class described including a revolving mullermecha- 'nism, and'ja cc'g'm'bination material deflecting hood "and' weight removably meunted thereon for varying the effective pressure exerted "b'y the 'muller mechanism. a k

l0. In a small --portable mulling machine, a

meansand through said cover for permitting lift- '11. A small portable 'materialmul-ling'and mixing machine comprising a crib, a horizontally operating discharge door therein, a base secured to and supporting said crib, driving means in said base, a turret formed in said crib, a shaft operated by the driving means and projecting through the turret, a propulsion head on said shaft and driven thereby, roller bearing means between said shaft and turret for transferring the load carried by the propulsion head to the turret, plow means carried by the propulsion head for operation thereby, muller mechanisms adjustably sup-- ported on the propulsion head and operable thereby, a cap rigidly secured on the propulsion head, a lifting member secured to the cap to permit lifting and movement of the machine into different locations, an apertured weight member removably supported on the muller mechanisms for varying the effective weight thereof, cushioning means between said weight member and said mulling mechanisms, and a cover removably and rotatably supported on the crib to enclose the propulsion head and the mechanisms and parts supported thereon, said cover having an opening therein to permit the liftin member to project upwardly out of the cover.

12. In a portable muller assembly, a wall defining a mulling area, power driven rotary mulling unit in the center of the mulling area including opposed mulling rolls which are each canted at such an angle as to converge adjacent the top of the wall and to diverge at the bottom, said wall and unit being connected so as to be elevated and lowered bodily together with respect to the floor of the foundry and the like, and a hoist connection attached to the said unit and by means of which the portable muller assembly may be connected to a hoist.

13. In a portable muller, a wall defining a muller roll area and arranged to be supported spaced from the floor, canted muller rolls in said area above said space, said wall at its bottom having an opening through which material may be discharged from the area defined by the wall downwardly into said space, and a hoist attachment extending above the wall by means of which the muller rolls and wall may be bodily moved away from said space.

14. In a portable muller, a wall defining a muller roll area and arranged to be supported spaced from the floor, canted muller rolls in said area above said space, said wall at its bottom having an opening through which material may be discharged from the area defined by the wall downwardly into said space, and a hoist link extending above the wall directly over the muller rolls by means of which the muller rolls and wall may be bodily moved away from said space, said space being defined by a bottom support between said area and the floor and being substantially within the confines of the support. 7

15. A mulling machine comprising a container, a driving shaft journalled therein, means for opcrating the driving shaft, a propulsion head on the driving shaft within the container, muller supports pivotally supported on th propulsion head, beveled mullers rotatably supported on said muller supports with the mullers canted with respect to one another, support members on said muller supports, a weight member removably positioned on said support members for varying the effective operating weight of the beveled canted mullers, and cushioning means between said support members and the weight member.

ALFRED C. CHRISTENSEN. 

